Numerical simulations of acoustic cavitation noise with the temporal fluctuation in the number of bubbles
Yasui, K, Tuziuti, T, Lee, J, Kozuka, T, Towata, A and Iida, Y (2010) Numerical simulations of acoustic cavitation noise with the temporal fluctuation in the number of bubbles Ultrasonics Sonochemistry, 17 (2). pp. 460-472.
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Numerical simulations of cavitation noise have been performed under the experimental conditions reported by Ashokkumar et al. (2007) . The results of numerical simulations have indicated that the temporal fluctuation in the number of bubbles results in the broad-band noise. "Transient" cavitation bubbles, which disintegrate into daughter bubbles mostly in a few acoustic cycles, generate the broad-band noise as their short lifetimes cause the temporal fluctuation in the number of bubbles. Not only active bubbles in light emission (sonoluminescence) and chemical reactions but also inactive bubbles generate the broad-band noise. On the other hand, "stable" cavitation bubbles do not generate the broad-band noise. The weaker broad-band noise from a low-concentration surfactant solution compared to that from pure water observed experimentally by Ashokkumar et al. is caused by the fact that most bubbles are shape stable in a low-concentration surfactant solution due to the smaller ambient radii than those in pure water. For a relatively high number density of bubbles, the bubble-bubble interaction intensifies the broad-band noise. Harmonics in cavitation noise are generated by both "stable" and "transient" cavitation bubbles which pulsate nonlinearly with the period of ultrasound.
|Subjects :||Chemical and Process Engineering|
|Divisions :||Faculty of Engineering and Physical Sciences > Chemical and Process Engineering|
|Date :||1 February 2010|
|Identification Number :||10.1016/j.ultsonch.2009.08.014|
|Copyright Disclaimer :||Copyright © 2009 Elsevier B.V.|
|Additional Information :||Item not available from this repository.|
|Depositing User :||Symplectic Elements|
|Date Deposited :||16 Aug 2016 13:33|
|Last Modified :||16 Aug 2016 13:33|
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